The current version of Circle Dock 0.9.2 utilizes a skin and icon fromhttp://desktop.google.com/plugins/i/windowsdock_stefanva.html?hl=en,
which is the source of inspiration for the look of the current version
of Circle Dock. That program is called Windows Dock and is made by
Stefan vd and is made available under the GNU General Public License
which means that it is open source, just like Circle Dock is.